<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../../js/utils.js"></script>
    <style>
        #box {
            width: 100px;
            height: 100px;
            border: 1px solid red;
            margin-top: 50px;
            background-color: aqua;
        }
    </style>
</head>

<body>
    <div id="box"></div>
    <script>
        var oBox = document.getElementById('box');
        console.log(utils.css(oBox, 'marginTop'));
        utils.css(oBox, 'width', 600);
        utils.css(oBox, {width:200, height:200, backgroundColor:'skyblue', opacity:0.3});

        console.log(utils.testType(oBox, 'HTMLDivElement'));
    </script>
</body>

</html>